Which was working fine with my Swisscom box, however when i turn on my Swisscom box it says there is no power from the TV interface. Sometimes the box will come on and work normally and then again it says its turned off.
I have tried changing the HDMI ports and restarting it.
Other external sources work fine with my TV regardless of the HDMI port
Have you ever tried resetting the TV box? Depending on the box, you can do this with a paper clip on the back or underside - press the hole for about 30 seconds so that a new current image is downloaded directly from Swisscom.